Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
van thanh » ban thanh, van tuan
xach tay » canh tay
phan cua » nhan cua, than cua, phat cua
thuc van » thuc vat, thuc dan, thuc va
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so ((xach tay) or (sach tu)) ((nang xa) OR (lang xa)) hoi. hieu van nam thuc van thanh phan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((xach tay) OR (sach tu)) ((nang xa) OR (lang xa)) hoi. hieu van nam thuc van thanh phan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((xach tay) or (sach tu)) ((nang xa) OR (lang xa)) hoi. hieu van nam thuc van thanh phan cua tre".
• Adding a wildcard symbol may retrieve word variants: so ((xach tay) or (sach tu)) ((nang xa) OR (lang xa)) hoi. hieu van nam thuc van thanh phan cua tre*.